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T. H. LIDFORD. STEAM VALVE.

No. 65,921. Patented June 18, 186'? uiten tst'zsstmt ffice..

,THoMAs H, LIDFORD, 0F NonflliiV ADAMS, MASSACHUSETTS. 'Leserinnen No. 65,921', and .Imis 1867.

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TO ALL WHOM IT MAY'CONCERN:

'.Be it known that '.I, .THOMAS-H. LIDFORD, of North Adams, Berkshire county, Commonwealth of Massechusetts, haveinventeda new and-useful, Improved Steam-Valve; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon. In the drawings Figurel is a side sectional view of my invention.

This invention consists of a new and improved arrangement ofthe valve ina petit cock, by which the latter is made perfectly steanbtight, and less liable to wear or get ont of order. By my arrangement the valve can also be easily taken entirely out of its seat, when it is desired to inspect it. I

In. construction, I place my valve in the pipe'A, which has an elbow, B, with a chamber, C, in it. The' valve itself consists of two wedge-shaped pieces D and E, which, when pnt together with their inclined facesmeetixgfcm a cylindrical piece which exactly and tightly fills the valve-seat between the edges of the pipe above and below. These pieces 'are operated bythe hand-screw` F, which has a shaft, G, with threads a a cut upon it, `the latter working in corresponding threads ont in the I cap H, which fills up the outer end of the pipe B, having the chamber C. The end of the shaft G has around its circumference two projections, 6 and c, shown' in iig. 1 by dotted lines.- These work in bearings out .in the pieces forming the valve, and serve -to carry the same in either -direction along with the shaft, as the latter is moved backwards cir-forwards, as may be the case; the shaft being tnrned by the wheel at one end, and being operated so as to have the motion required by means ofthe threads cut upon it. As may be seen by the dotted lines, the end of the shaft works, when turned, in

grooves macle for it in the pieces D and E. The cap H is screwed into the end of the chamber C, so that it isV only necessary to nnsorew it in order to remove the whole mechanism of theyalve.

The operation of this valve is as follows: The shaft being turned, pushes the piece D of the valve against the front side of the valve-seat at f. Now, by still turning the shaft, the piece E is crowded forward, throwing it upwards, and the piece Dl down, with their upper and lower faces tightly pressed against tlie edges of thev valve-seat, completely stopping o' all communication between the di'erent portions of the pipe A. Generally,

I place the pieces D and E in such a manner that the steam, in passing the valve,.(when the latter is drawn back,) rushes by the broad portion of the piece D first, and the lpiece E being drawn back further than the otherf the steam does not rush against the edge of the piece E, and tend to rattle the valve and cause wear. By this means I obtain a perfectly tight valve, using the powers of the screw and wedge4 in combination to bring the faces of the valve against the edges of the pipe, and being at no inconvenience in removing the valve for inspection.

And now, having described my invention, what I claim as new, and desire to secure by Letters Patent, is---V-V The arrangement of tbe'wedge-shaped pieces D and E, with reference to the shaft G and collars d -and e,

substantially as described.

' THOMAS H. LIDFORD.' Witnesses:

Mnnmcx M. BARNES, Jona Busan. 

